If I want a evil drow NPC, I'd prolly go with either Ghaunadaur or Vhaeruan. I like Vhaeraun more, but it depends on the needs of the NPC. For a non-evil drow NPC (or PC), I'd go with either Eilistraee or some non-drow deity. Again, depends on the needs of the character.

In my opinion, the changes made to the realms with 4E are neither necessary, nor good. Just stick with the prior realms Ė many gods will thank you.---When talking about rules (and related stuff) I always refer to 3.5e unless explicitly noted.

For game purposes Kiaransalee is the most interesting in my opinion. I assume others agree since City of the Spider Queen focused on her = P I prefer to think after being "erased" by Q'Arlynd she returned to the realms over time... I think she is a better deity of Necromancy than Velsharoon. Velsharoon seems too stereotypical bland necromancer.

"These things also I have observed: that knowledge of our world isto be nurtured like a precious flower, for it is the most preciousthing we have. Wherefore guard the word written and heedwords unwritten and set them down ere they fade . . . Learnthen, well, the arts of reading, writing, and listening true, and theywill lead you to the greatest art of all: understanding."Alaundo of Candlekeep

"These things also I have observed: that knowledge of our world isto be nurtured like a precious flower, for it is the most preciousthing we have. Wherefore guard the word written and heedwords unwritten and set them down ere they fade . . . Learnthen, well, the arts of reading, writing, and listening true, and theywill lead you to the greatest art of all: understanding."Alaundo of Candlekeep

Call me a "goody-goody", but I've always liked Eilistraee the most. She is the most sensible and level-headed of the drow deities, and the only one who does not have some ultimately self-serving goal. She made her choice out of selfless love and hope, and I love her portfolio of music, dance, and sword-work (all things which I myself love). The music and dance aspects in particular are very underrated among the drow, since they spend so much time trying to kill each other, they never seem to have any left over for simple pursuits of enjoyment. She fills that need. Her tenets of spreading joy and aiding those in need even when they behave rudely speaks to my "nice gal" side.

Now, if I were to pick an evil deity, I'd go with Zinzerrena. She is not as well-known as the others, but her independence, cleverness, and chutzpah appeal to me. She's the ultimate rogue and hunter among drow!

"These things also I have observed: that knowledge of our world isto be nurtured like a precious flower, for it is the most preciousthing we have. Wherefore guard the word written and heedwords unwritten and set them down ere they fade . . . Learnthen, well, the arts of reading, writing, and listening true, and theywill lead you to the greatest art of all: understanding."Alaundo of Candlekeep

Kiaransalee, mostly on account of the goods in City of the Spider Queen. 'Psychotic goddess of undeath and vengeance' is pretty cool in itself, then all her wonky minions to boot. Second choice would probably be Lolth, followed closely by Eilistraee. The entire Dark Seldarine has loads of quality drama going on, I should really try to get it on the game table more...

I find her extremely intriging, there's a lot more lore regarding her, especially non FR related stuff. She is actually still alive in the other settings. I like how she's chaotic neutral and seeks the down fall of Lolth. It's really interesting that she was so powerful a rogue, that she rose to divinity (either when she triked Keptolo or when drow started to worship her). I just like her a lot.